The Fireface 800 does not allow to SPDIF I/O at the same time. You have the option for an SPDIF with one or two ADAT's.
This is a big limitation IMO. Any way to use the 2nd ADAT connection to send/receive SPDIF (in other words, only using 2 of the 8 ADAT channels).
Are there any format converters that would work for this purpose?